Soot brush



July" 28, 1931. s, G; BLADH ET AL 1,816,761

SOOT BRUSH Filed April 15, 1929 Patented July 28, 1931 UNITED STATES PATENT OFFICE SVEN GUSTAF BLADH, OF MALMO, AND GUSTAF EMANUEL BROFELTH, OF HALMSTAD,

SWEDEN, ASSIGNORS T AKTIOBOLAGET MALGUS HOLMQUIST, OF HALMSTAD,

SWEDEN SOOT BRUSH Application filed April 15, 1929, Serial No. 355,342, and in Sweden March 2, 1928.

This invention relates to soot brushes. The invention has for its object an improvement in soot brushes particularly for use in cleaning the outsides of boiler tubes, f and each brush consists of a stem having side grooves for removable wire brushes.

' The purpose of the invention is to form the brush as thin as possible so as to accommodate very closely positioned tubes. Consequently the wire brushes as well as the stem must be given such a shape that they will occupy a minimum of space.

In the drawings some embodiments of soot brushes according to the invention are diagrammatically illustrated.

Fig. 1 shows a section of a part of a wlre brush with wires on both sides of a knife or a soldered strip. Fig. 2 a similar view with wires soldered to one side only of the strip. 30 Fig. 3 a similar view with wires soldered to one side of a strip, which afterwards has been folded to cover both sides of the wires. Fig. 4 is a partial view in perpsective of Figure 3. Figs. 5 and 6 show part of a stem, in side and sectional views respectively with wires only along one edge of the stem, and Figs. 7, 8, 9 .and 10 another stem with wires along both edges. Fig. 7 shows the stem in plan view, Fig. 8 the top end of the stem from the side. Fig. 9 is a central horizontal section and Fig. 10 shows the lower part of the stem with a handle.

In the wire-brush shown in Fig. 1, the wires 1 and 2 lie close together in one layer on each :75 side of the strip 3. If more layers be used,

the wires will become denser, but at the same time the brush will become thicker. The strip 3 can also be placed outside of the wires 1 and 2 instead of between them as shown in Figure 2. In either case each wire 1 is integral with a corresponding wire 2. In the wire-brush shown in Figs. 2-4 the wires 1 and 2 lie close together on the same side of the strip 3, and every second wire 1 is bent a little to one side of the strip and the remainder of the wires to the other side, as is clearly shown in Fig. 4. With a single layer the wires in these brushes will become only half as dense as in the wire brush shown in Fig. 1, but even this brush may easily be other at the fixing point, and using the free strip or knife 3 to fasten the brush to the stem, as will be described hereafter. VJ hen doing this either the wires 1 or the wires 2 may be soldered together at the ends and then applied to the stem by means of the knife 3.

When making the wire brush shown in Fig. 1 straight, out wires are placed close together, side by side, and kept in position by a suitable clamping implement during the solder- 7 I 111g and then bent. If the wires are soldered to the strip 3 the brush may be made of the same length as the stem, by means of which it is held, during the desooting operation. Otherwise the brushes can be made shorter, about mm., and placed on the knife 3, by which they are inserted and fastened in the stem.

The stem 8 shown in Figs. 5-6 consists of two plates riveted 01' otherwise fastened tightly together, after which both plates are folded double to form a groove for the brush 1, 2, 3. This groove or recess is perfectly straight and partly closed at the end, where either a pair of cut out tongues 9 or an inward bend forms a stop for the end 11 of the strip 3.

In the brush shown in Figs. 7-10 the fastening arrangements for the knives consists of an inward bend 10 at the upper end of the stem 12 and of a resilient pawl, or a bolt at the lower end. This bolt 13 may be made long if desired, for this part of the handle close to the wooden handle 15 will never reach in between the tubes. flaps 10 may be fastened by means of rivets 20 or soldered together or they may be kept together simply by means of the rivet 14. As shown in these figures the stem will become a. little thinner than as shown in Fig.

The incurved n 6 because the plates are not folded double, but only bent inwards and riveted at 14.

' Moreover, the thinnest knife type, shown in til Fig. 2, is used here, fastened on to each edge of the, stem 12. Thus four rows of wires are provided instead of two as in the brush shown in Figs. 56. The stem shown in 9 may quite well be iven only one row of wire brushes along one of the edges, the other edge being left empty. Alterna: tively, only one row of wires for instance 1, may be put in at each edge of the stem. The

' type of wire brush shown in Fig.1 may of course be used for this stem 111 the same'way' as ust described with regard to Figs, 5-6

The disadvantage with the old S-type of soot brushes for Yarrow boilers was, that it could not sweep two ad acent tubes equally the far ends, because one ofthe wire rows placed at one side of the-handle and bent in one direction,while the other wire row was placed at the other side of the handle and bentthe opposite way. On the soot brush shown in Figs. 5-6 two wire rows are placed opposite each other, thus, enabling the sweeping of two adjacent tubes equally to the far ends of both tubes. If sweeping is to be performed equally far to the other ends of the same tubes, the brush must be drawn out from the row of tubes I and turned. This can be avoided by giving the brush rows of wire brushes at both edges, as shown in Figs. 7-10. In spite of its four rows of wires, this type of soot brush does not occupy more space between the tubes than the old Yarrow brush; On the contrary it may be made still thinner than this, as we here employ only three thicknesses of plate and one of wire as shown in Fig. 9. that is to say, with one plate thickness less.

We claim 1'. A soot brush compising a strip, wire bristles secured in a layer upon one side of said strip and having a holder having a groove therein in which said strip with bristles attached may be removably secured.

2. A soot brush comprising a strip, wire bristles secured to one of the side edges of said strip, said wire bristles being alternately bent s'oas to form two rows of bristles and a holder having a longitudinal groove therein in which said strip may be removably seated.

3. A soot brush comprising a strip, wire bristles secured to said strip so as to form two rows of wires projecting from one of the side'edges of said strip, the bristles in each row being bent away from each other andone' wire of one row being integral with a wire positioned in the other row and a holderhaving a longitudinal groove therein for accommodating said strip.

4:. A soot brush comprising a strip, wire bristles secured to said strip projecting from one of the side edges thereof, "alternate rections so as to form two'rows" of wire bristles, and a holder formed of two interconnected plates spaced so as to form a groove adapted to secure said strip.

6. A soot brush comprising a strip, wire bristlessecured upon one side of saidstrip havingalternate bristles bent in opposite directions so as to form two rows of wire bristles, and a holder formed of-two spaced plates having their-side edges bent outwardly in order to form a groove to cooperate with said strip. v I I In testimony whereof we have signed our names to this specification.

SVEN GUSTA'F BLADH GUSTAF EMANUEL BROFELTH. 

